单项选择题

It will rain, ______ the barometer is falling.

A．so
B．for
C．as
D．since
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单项选择题
Dr Meck wrote: As is true with most animals, the wolf is an opportunist whilst the deer is one of the shyest ______ animals in existence.
A．savage
B．tame
C．wild
D．strange
单项选择题
I regret ______ you that I can't go to Hangzhou for a visit next Sunday with you, because I've caught a bad cold.
A．to tell
B．telling
C．tell
D．having told
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